Machine for grinding and shaping



March. 7, 1939.

MACHINE FOR GRINDING AND SHAPING f Filed March 29, 1937 INVENTOR.

e. HE lT LER 2,149,258

3 Sheets-Sheet 1 March '7, 1939. G R 2,149,258

MACHINE FOR GRINDING AND SHAPING Fil'ed March 29, 1937 3 Sheets-Sheet 2 INVENTOR.

m F4 r/ si v March 7, 1939. G. HEITLER 2,149,258

MACHINE FOR GRINDING AND SHAPING Filed March 29, 1937 H 3 Sheets-Sheet 5 Patented Mar. 7, 1939 UNITED STATES PATENT OFFICE 2 Claims.

The principal object of this invention consists in providing asimple and economical grinding machine suitable for household use, another important object of this invention consists in providing a simple machine for accurate sharpening, and other uses. With the above and other objects in view, which will be hereafter fully described and claimed, and in order to render my invention clearer in its working, I have attached loathe following drawings, in which:

' Fig. 1 indicates a plan view of a carborundum grinding stone, used in this machine.

Fig. 2 indicates in cross sectional elevation, another grinding stone, provided with side grooves 15, 01- shaping channels, also used in this machine.

' Fig. 3 indicates in top plan View a graded guide used in this invention.

Fig. 4 indicates in back view elevation, the same guide shown in Fig. 3.

Fig. 5 indicates a fragmentary view, taken through AA of Fig. 4.

Fig. 5A is a washer used in fragmentary view Fig. 5.

Fig. 5B is a view in elevation of the washer 25 shown in Figure 5A.

Fig. 6 indicates a front elevation of the frame on which other parts are mounted.

Fig. 7 is a side elevation view of Fig. 6.

Fig. 8 shows my machine assembled.

30 Fig. 8A is a detail for electrically operating this machine.

Fig. 9 indicates a side elevation view, as the arrow points of Fig. 8.

Figs. 10 and 11 are details of a nut used in my invention.

In Fig. 1, numeral indicates a conically shaped carborundum wheel, with its upper face 2, of a smaller diameter, and provided with hole at its centre 4. This wheel may or may not not be 40 provided with side cavities or grooves, as indicated at 5, 6 in Fig. 2. In Fig. 2 is indicated in cross sectional elevation, one of said wheels, with details of its mounting. The wheel 2 is moulded on a steel support 1. This support is provided 5 with an extension tubing 8, and rigidly connected to a conical gear l0. Said gear is provided with a hole I I through which a shaft 9 can pass. This shaft has a narrow neck at l3, for the purpose of being held in the extension tube 9 by 50 means of a pressure screw 40. When the gear is rotating, the wheel moves with it, while the shaft 9 stands still. Fig. 3 is a plan top view of the sharpening guide of my invention. It consists of a piece of cast steel |4, provided with graded 55 steps, all around it, as shown at l5, l6, Nu-

meral l8 indicates an extension log of said guide, and intended to hold large tools. The purpose of these steps on the guide is for setting knives on same, for properly regulating the sharpening angle. Fig. 4 is a back view elevation of Fig. 3. 5

This drawing shows more constructional details of the sharpening guide. Said guide, on its low portion is provided with two extension pieces 4|, 4|. These pieces are of some material and channel shaped, as at l9, l9, and also provided 101:"

channel IS a washer 39 is inserted when neces- 152-- sary, for the purpose of adjusting the guide to or fro, on the grinding stone. Fig. 5A indicates said Washer. The hole is for admitting a bolt 38, Fig. 11, and thus fastening the guide to the frame of the machine. Fig. 6 indicates in front eleva- 20 tion said frame. It consists of a table 24, on which are mounted two sliding guides 22, 22, having their central portions hollow as at 23, 23. Said sliding guides are fastened to the table by means of screw 25, 25. In order to attach my machine to any table, I provide an angle iron 26, with a variable screw 21, to press against the holding table. The sliding pieces 22, 22, are made to fit into parts l9, l9, and will permit to regulate the sharpening guide, either up or down, as the case may require.

Fig. 7 indicates a side view of Fig. 6, showing more details. In this view a supporting standard 28, with hole 29 through which a shaft will pass, in order to impart motion to the machine, is shown.

Fig. 8 shows an assembly of this invention. Numeral is the grinding wheel. Numeral I 4 is the sharpening guide as shown in Fig. 3 and Fig.

4. Numerals 22, 22 indicate the sliding guide of the frame on which the sharpening guide is mounted, as indicated in detail at Fig. 6. The

rotation of the wheel is imparted through a gear arrangement, and it can be operated by hand or motor, according to the size of the machine. The large gear 3|, engages gear l0, which rotates on stationary support 9. When the machine is operating, by rotating shaft 34 with handle 33, the speed ratio is about 6 to 1, or for each revolution of gear 3|, there will be 6 revolutions made by gear ID. This type of gear is suitable to change, according to conditions, and for type of machines built along these lines. For large machines, an electric motor is used, as indicated in Fig. 8A.

Numeral 34 is the shaft, and 50, 5| are two pulleys, and belt 52, with a motor 53, as motive power.

Fig. 9 is a fragmentary side view of Fig. 8, taken as the arrow points. Numeral I0 is the small gear engaging the large gear 3|. The shaft 34 is supported and rotates in part 28, by means of handle 33.

Figs. 10 and 11 are details of a special nut, used in this invention. Nuts of this kind are used to fasten the sharpening guide on regulating guides, as indicated in assembly drawing Fig. 8, at 30, 30. Said nut is of pyrametric shape, or provided with the low base 30, slightly larger than the upper one 35. For about one third of its length, it is provided with a cut 36, for the purpose of applying said nut, with a screw driver, or other means. Said nut is provided with a threaded hole 31, in which a bolt 38 can be inserted.

It should be understood, that having thus described my invention, I do not intend to limit myself to the present construction. There can be made many changes, in order to render it perfect, but still remaining in the spirit of my invention.

Having thus described my invention, what I wish to be protected by Letters Patent, in the United States, and what I claim is:

1. In a machine of the type described in combination, a base, a shaft extending vertically from said base, a frusto-conical grinding element carried by said shaft upon the upper end thereof, means for rotating said shaft, a pair of standards extending vertically from the base in spaced relation to each other, a tool rest embracing the grinding element and conforming to the crosssectional shape thereof, said tool rest comprising a main body portion extending across the top face of the grinding element, a leg depending angularly from each end of the main body portion in spaced parallel relation with the sides of the grinding element, a plurality of stepped tool supporting surfaces upon the outer face of the main body portion of the tool rest and of the depending legs thereof, means carried by said depending legs for sliding engagement with said aforementioned standards and means for adjustably securing said tool rest to said standards 2. In a machine of the type described in combination, a base, a shaft extending vertically from said base, a frusto-conical grinding element carried by said shaft upon the upper end thereof, means for rotating said shaft, a pair of standards extending vertically from the base in spaced relation to each other, a tool rest embracing the grinding element and conforming to the crosssectional shape thereof, said tool rest comprising a main body portion extending across the top face of the grinding element, a leg depending angularly from each end of the main body portion in spaced parallel relation with the sides of the grinding element, a plurality of stepped tool supporting surfaces upon the outer face of the main body portion of the tool rest and of the depending legs thereof, means carried by said depending legs for sliding engagement with said afore-mentioned standards and means for securing the tool rest to the afore-mentioned standards in a manner to permit of its adjustment relatively to the grinding element in right angular planes.

GEORGE HEITLER. 

